TWI770862B - Lens assembly - Google Patents

Abstract

A lens assembly includes a first lens group, a second lens group, a third lens group, a fourth lens group, and a fifth lens group, all of which are arranged in order from a first side to a second side along an axis. The first lens group is with positive refractive power. The second lens group is with negative refractive power. The third lens group is with positive refractive power. The fourth lens group is with negative refractive power. The fifth lens group is with positive refractive power. Light from an object side sequentially passes through the first lens group, the second lens group, the third lens group, the fourth lens group, and the fifth lens group to the second side. The lens assembly further includes a reflective element disposed between the first side and the second side, wherein the reflective element includes a reflective surface. The intervals between the lens groups can be changed to change an effective focal length of the lens assembly.

Description

Imaging Lens(58)

The present invention relates to an imaging lens.

The total length of the optical zoom lens of the traditional structure is long, and the total length of the lens becomes longer with the higher the zoom ratio. Today's smart phones that emphasize thin and light cannot be equipped with the optical zoom lens of the traditional structure. Therefore, another imaging lens with a new architecture is required to meet the requirements of miniaturization, high resolution and optical zoom function at the same time, in order to meet the demand for optical zoom function of smart phones.

In view of this, the main purpose of the present invention is to provide an imaging lens, which has a shorter overall lens length, higher resolution, and an optical zoom function, but still has good optical performance.

The imaging lens of the present invention includes a first lens group, a second lens group, a third lens group, a fourth lens group and a fifth lens group. The first lens group has positive refractive power. The second lens group has negative refractive power. The third lens group has positive refractive power. The fourth lens group has negative refractive power. The fifth lens group has positive refractive power. The first lens group, the second lens group, the third lens group, the fourth lens group and the fifth lens group are sequentially arranged along an axis from a first side to a second side. Light from an object side sequentially passes through the first lens group, the second lens group, the third lens group, the fourth lens group and the fifth lens group to the second side. Can further include a reflective element, the reflective element package It includes a reflective surface, and the reflective element is arranged between the first side and the second side. The distance between these lens groups can be changed to allow the imaging lens to change the focal length.

The imaging lens of the present invention may further include a light-shielding element disposed between the first lens group and the second lens group, the light-shielding element includes a variable hole, and the variable hole can be correspondingly changed according to different focal lengths of the imaging lens, Variable holes are non-circular holes.

Wherein, the optical effective diameter of at least one lens in the short side direction of the lens groups is different from the optical effective diameter length of the long side direction, and the fourth lens group can move along the axis to make the imaging lens focus.

The third lens group includes a plurality of lenses, and some of the lenses can be moved along the vertical axis direction to achieve optical anti-shake.

The second lens group, the fourth lens group and the fifth lens group can move along the axis, the first lens group and the third lens group are fixed to change the distance between these lens groups, so that the focal length of the imaging lens can be changed, and the reflective element is arranged between the first side and the first lens group.

The reflective element may further include an aperture disposed between the second lens group and the third lens group, and the reflective element may further include an incident surface and an exit surface connected to the reflective surface, the incident surface facing the object side along the vertical axis direction, the The exit surface faces the second side along the axis, and the imaging lens meets at least one of the following conditions: 0.5mm<EPA/PL<5.5mm; 0.7mm<EPA/STD<10mm; 0.2<EPDX/STD<2.1; 0<EPDY/ STD<1.5; 0.8<PL/EPDX<4; 0.7<PH/EPDY<3; among them, EPA is an area of an entrance pupil of an imaging lens, PL is a length of a reflective element, and this length is equal to a side length of a reflective surface A length, this side length is perpendicular to the axis, STD is a diameter of the aperture, EPDX is the maximum entrance pupil distance of the entrance pupil through one of the axes, EPDY is the minimum entrance pupil distance of the entrance pupil through one of the axes, and PH is the reflective element. a height equal to the A length of one of the sides of the incident surface, which is perpendicular to the incident surface.

The first lens group includes a 1-1 lens and a 1-2 lens, the 1-1 lens has a negative refractive power, the 1-2 lens has a positive refractive power, and the 1-1 lens and the 1-2 lens are along the axis from the first side Arranged sequentially to the second side, the second lens group includes a 2-1 lens, a 2-2 lens and a 2-3 lens, the 2-1 lens has negative refractive power, the 2-2 lens has negative refractive power, and the 2-3 lens has negative refractive power. The lens has positive refractive power, the 2-1 lens, the 2-2 lens and the 2-3 lens are arranged in sequence from the first side to the second side along the axis, and the third lens group includes a 3-1 lens and a 3-2 lens , a 3-3 lens and a 3-4 lens, the 3-1 lens has positive refractive power, the 3-2 lens has positive refractive power, the 3-3 lens has negative refractive power, the 3-4 lens has negative refractive power, the 3-1 lens, The 3-2 lens, the 3-3 lens and the 3-4 lens are sequentially arranged along the axis from the first side to the second side, the fourth lens group includes a 4-1 lens, the 4-1 lens has negative refractive power, and the fifth lens group has a negative refractive power. The lens group includes a 5-1 lens, and the 5-1 lens has positive refractive power.

The 1-1 lens is a meniscus lens, the 1-2 lens is a biconvex lens, and includes a convex surface facing the first side along the axis and another convex surface facing the second side along the axis, and the 2-1 lens is a meniscus. The lens includes a convex surface facing the first side along the axis and a concave surface facing the second side along the axis. The 2-2 lens is a biconcave lens and includes a concave surface facing the first side along the axis and another concave surface along the axis. toward the second side, the 2-3 lens includes a convex surface along the axis toward the first side, the 3-1 lens is a plano-convex lens and includes a convex surface along the axis toward the first side and a plane along the axis toward the second side, the The 3-2 lens is a biconvex lens and includes a convex surface facing the first side along the axis and another convex surface facing the second side along the axis, the 3-3 lens is a meniscus lens, and includes a concave surface facing along the axis. The first side and a convex surface are facing the second side along the axis, the 3-4 lens is a meniscus lens, and includes a convex surface facing the first side along the axis and a concave surface facing the second side along the axis, the 4-1 lens It is a meniscus lens, and the 5-1 lens is a meniscus lens.

The 1-1 lens includes a convex surface facing the first side along the axis and a concave surface facing the second side along the axis, the 2-3 lens may further include a concave surface facing the second side along the axis, and the 4-1 lens includes a convex surface The 5-1 lens includes a convex surface facing the first side along the axis and a concave surface facing the second side along the axis.

The 1-1 lens includes a concave surface facing the first side along the axis and a convex surface facing the second side along the axis, the 2-3 lens may further include another convex surface facing the second side along the axis, and the 4-1 lens includes a The concave surface faces the first side along the axis and a convex surface faces the second side along the axis. The 5-1 lens includes a concave surface facing the first side along the axis and a convex surface facing the second side along the axis.

The reflective element may further include an incident surface connected to the reflective surface, the incident surface faces the object side along the vertical axis, and the imaging lens satisfies at least one of the following conditions: 1.5<f1/fW<2.5;-1.1<f2/fW<-0.3;0.6<f3/fW<0.8;-2<f4/fW<-0.5;1<f5/fW<3.5;2<TTL/fW<4.5;0.5<fT/TTL<1;7mm<Dmax<12mm;3.8<TTL/Dmax<5.2;2.9<fT/D1r1<4.2; where f1 is an effective focal length of the first lens group, f2 is an effective focal length of the second lens group, and f3 is an effective focal length of the third lens group , f4 is an effective focal length of the fourth lens group, f5 is an effective focal length of the fifth lens group, fW is an effective focal length of the imaging lens at the wide-angle end, fT is an effective focal length of the imaging lens at the telephoto end, TTL It is the distance from the incident surface of the reflective element to an imaging surface in the vertical axis direction and on the axis, D _MAX is the largest optical effective diameter of all lenses, and D1r1 is the distance between the first side of the lens closest to the first side. an optically effective diameter.

In order to make the above objects, features, and advantages of the present invention more clearly understood, preferred embodiments are hereinafter described in detail with the accompanying drawings.

1, 2, 3, 4: Imaging lens

P1, P2, P3, P4: Reflective elements

LG11, LG21, LG31, LG41: The first lens group

ST11, ST21, ST31, ST41: shading element

LG12, LG22, LG32, LG42: Second lens group

ST12, ST22, ST32, ST42: Aperture

LG13, LG23, LG33, LG43: The third lens group

LG14, LG24, LG34, LG44: Fourth lens group

LG15, LG25, LG35, LG45: Fifth lens group

OF1, OF2, OF3, OF4: Filters

L11, L21, L31, L41: 1-1 lens

L12, L22, L32, L42: 1-2 lens

L13, L23, L33, L33: 2-1 lens

L14, L24, L34, L44: 2-2 lens

L15, L25, L35, L45: 2-3 lenses

L16, L26, L36, L46: 3-1 lens

L17, L27, L37, L47: 3-2 lens

L18, L28, L38, L48: 3-3 lens

L19, L29, L39, L49: 3-4 lenses

L110, L210, L310, L410: 4-1 lens

L111, L211, L311, L411: 5-1 lens

IMA1, IMA2, IMA3, IMA4: Imaging plane

OA1, OA2, OA3, OA4: axis

S11, S21, S31, S41: Incident surface

S13, S23, S33, S43: Exit surface

S14, S24, S34, S44: 1-1 lens first side

S15, S25, S35, S45: 1-1 lens second side

S16, S26, S36, S46: 1-2 lens first side

S17, S27, S37, S47: 1-2 lens second side

S18, S28, S38, S48: shading element surface

S19, S29, S39, S49: 2-1 lens first side

S110, S210, S310, S410: 2-1 lens second side

S111, S211, S311, S411: The first side of the 2-2 lens

S112, S212, S312, S412: 2-2 lens second side

S113, S213, S313, S413: The first side of the 2-3 lens

S114, S214, S314, S414: 2-3 lens second side

S115, S215, S315, S415: Aperture surface

S116, S216, S316, S416: 3-1 lens first side

S117, S217, S317, S417: The second side of the 3-1 lens

S118, S218, S318, S418: The first side of the 3-2 lens

S119, S219, S319, S419: The second side of the 3-2 lens

S120, S220, S320, S420: 3-3 lens first side

S121, S221, S321, S421: The second side of the 3-3 lens

S122, S222, S322, S422: 3-4 lens first side

S123, S223, S323, S423: 3-4 lens second side

S124, S224, S324, S424: The first side of the 4-1 lens

S125, S225, S325, S425: The second side of the 4-1 lens

S126, S226, S326, S426: The first side of the 5-1 lens

S127, S227, S327, S427: The second side of the 5-1 lens

S128, S228, S328, S428: The first side of the filter

S129, S229, S329, S429: The second side of the filter

FIG. 1 is a schematic diagram of the lens configuration and optical path at the wide-angle end of the first embodiment of the imaging lens according to the present invention.

FIG. 2 is a schematic diagram of the lens configuration and optical path at the middle end of the first embodiment of the imaging lens according to the present invention.

FIG. 3 is a schematic diagram of the lens configuration and optical path at the telephoto end of the first embodiment of the imaging lens according to the present invention.

FIG. 4A is a field curvature diagram at the wide-angle end of the first embodiment of the imaging lens according to the present invention.

FIG. 4B is a distortion diagram at the wide-angle end of the first embodiment of the imaging lens according to the present invention.

5A is a field curvature diagram at the telephoto end of the first embodiment of the imaging lens according to the present invention

FIG. 5B is a distortion diagram at the telephoto end of the first embodiment of the imaging lens according to the present invention.

FIG. 6 is a schematic diagram of the length of the optical effective diameter of the lens in the short-side direction and the long-side direction of the first embodiment of the imaging lens according to the present invention at the telephoto end.

FIG. 7 is a schematic diagram of the lens configuration and optical path at the wide-angle end of the second embodiment of the imaging lens according to the present invention.

FIG. 8 is a schematic diagram of the lens configuration and optical path at the middle end of the second embodiment of the imaging lens according to the present invention.

FIG. 9 is a schematic diagram of the lens configuration and optical path at the telephoto end of the second embodiment of the imaging lens according to the present invention.

FIG. 10A is a field curvature diagram at the wide-angle end of the second embodiment of the imaging lens according to the present invention.

FIG. 10B is a distortion diagram at the wide-angle end of the second embodiment of the imaging lens according to the present invention.

FIG. 11A is a field curvature diagram at the telephoto end of the second embodiment of the imaging lens according to the present invention.

FIG. 11B is a distortion diagram at the telephoto end of the second embodiment of the imaging lens according to the present invention.

FIG. 12 is a schematic diagram of the lens configuration and optical path at the wide-angle end of the third embodiment of the imaging lens according to the present invention.

FIG. 13 is a schematic diagram of the lens configuration and optical path at the middle end of the third embodiment of the imaging lens according to the present invention.

FIG. 14 is a schematic diagram of the lens configuration and optical path at the telephoto end of the third embodiment of the imaging lens according to the present invention.

FIG. 15A is a field curvature diagram at the wide-angle end of the third embodiment of the imaging lens according to the present invention.

FIG. 15B is a distortion diagram at the wide-angle end of the third embodiment of the imaging lens according to the present invention.

FIG. 16A is a field curvature diagram at the telephoto end of the third embodiment of the imaging lens according to the present invention.

FIG. 16B is a distortion diagram at the telephoto end of the third embodiment of the imaging lens according to the present invention.

FIG. 17 is a schematic diagram of the lens configuration and optical path at the wide-angle end of the fourth embodiment of the imaging lens according to the present invention.

FIG. 18 is a schematic diagram of the lens configuration and optical path at the middle end of the fourth embodiment of the imaging lens according to the present invention.

FIG. 19 is a schematic diagram of the lens configuration and optical path at the telephoto end of the fourth embodiment of the imaging lens according to the present invention.

FIG. 20A is a field curvature diagram at the wide-angle end of the fourth embodiment of the imaging lens according to the present invention.

FIG. 20B is a distortion diagram at the wide-angle end of the fourth embodiment of the imaging lens according to the present invention.

FIG. 21A is a field curvature diagram at the telephoto end of the fourth embodiment of the imaging lens according to the present invention.

FIG. 21B is a distortion diagram at the telephoto end of the fourth embodiment of the imaging lens according to the present invention.

The invention provides an imaging lens, comprising: a first lens group, the first lens group has positive refractive power; a second lens group, the second lens group has negative refractive power; a third lens group, the third lens group It has positive refractive power; a fourth lens group, the fourth lens group has negative refractive power; and a fifth lens group, the fifth lens group has positive refractive power; wherein the first lens group, the second lens group, the third lens group , the fourth lens group and the fifth lens group are sequentially arranged along an axis from a first side to a second side; wherein the light from an object side passes through the first lens group, the second lens group, the first The three lens groups, the fourth lens group, and the fifth lens group are to the second side; which may further include a reflective element, the reflective element includes a reflective surface, and the reflective element is disposed between the first side and the second side; wherein The distance between these lens groups can be changed to allow the imaging lens to change the focal length.

The focal length of the imaging lens of the present invention is a variable focal length, and each embodiment of the imaging lens zooms from the wide-angle end to the telephoto end with a zoom ratio of about 3 times. , making the imaging lens of the present invention effective Compared with the effective focal length of the fixed-focus wide-angle lens, the focal length has, for example, a zoom ratio of 4 times to 12 times. Taking the imaging lens of the second embodiment of the present invention as an example, the effective focal length at the wide-angle end is 12.39mm, the effective focal length at the telephoto end is 37.20mm, and the zoom ratio from the wide-angle end to the telephoto end is 3.002 (37.20mm/12.39mm= 3.002) times, that is, about 3 times, when the fixed-focus wide-angle lens with an equivalent focal length of 3.1mm is configured on a mobile phone, the equivalent focal length of the fixed-focus wide-angle lens is used as the basis of the magnification, which will make the imaging lens of the present invention relative to the 3.1mm. A fixed-focus wide-angle lens with an equivalent focal length of 3.1mm, with a zoom ratio of 4(12.39mm/3.1mm=3.996≒4)x to 12(37.20mm/3.1mm=12)x.

Please refer to Table 1, Table 2, Table 4, Table 5, Table 7, Table 8, Table 10 and Table 11 below, among which Table 1, Table 4, Table 7 and Table 10 are respectively the first and second images of the imaging lens according to the present invention. Tables 2, 5, 8 and 11 of the relevant parameters of the lenses from the first embodiment to the fourth embodiment are the aspheric surfaces of the aspherical lenses in Table 1, Table 4, Table 7 and Table 10, respectively. Related parameter table.

Figures 1, 7, 12, and 17 are schematic diagrams of the lens configuration and optical path of the first, second, third, and fourth embodiments of the imaging lens of the present invention at the wide-angle end, respectively, and Figures 2, 8, 13, and 18 are respectively The first, second, third, and fourth embodiments of the imaging lens of the present invention are schematic diagrams of the lens configuration and optical path at the middle end. Schematic diagram of lens configuration and optical path at the telephoto end of the fourth embodiment, wherein the reflecting element P1 includes an incident surface S11, a reflecting surface S12 (not shown) and an exit surface S13, the first lens group LG11 has positive refractive power and includes a 1-1 lens L11 and a 1-2 lens L12, the second lens group LG12 has negative refractive power and includes a 2-1 lens L13, a 2-2 lens L14 and a 2-3 lens L15, and the third lens group LG13 has Positive refractive power and includes a 3-1 lens L16, a 3-2 lens L17, a 3-3 lens Lens L18 and a 3-4 lens L19, the fourth lens group LG14 has negative refractive power and includes a 4-1 lens L110, the fifth lens group LG15 has positive refractive power and includes a 5-1 lens L111; the reflective element P2 includes an incident Surface S21, a reflective surface S22 (not shown) and an exit surface S23, the first lens group LG21 has positive refractive power and includes a 1-1 lens L21 and a 1-2 lens L22, and the second lens group LG22 has negative refractive power And includes a 2-1 lens L23, a 2-2 lens L24 and a 2-3 lens L25, the third lens group LG23 has positive refractive power and includes a 3-1 lens L26, a 3-2 lens L27, a 3- 3 lenses L28 and a 3-4 lens L29, the fourth lens group LG24 has negative refractive power and includes a 4-1 lens L210, the fifth lens group LG25 has positive refractive power and includes a 5-1 lens L211; the reflective element P3 includes a The incident surface S31, a reflecting surface S32 (not shown) and an exit surface S33, the first lens group LG31 has positive refractive power and includes a 1-1 lens L31 and a 1-2 lens L32, and the second lens group LG32 has a negative refractive power. The refractive power includes a 2-1 lens L33, a 2-2 lens L34 and a 2-3 lens L35, and the third lens group LG33 has positive refractive power and includes a 3-1 lens L36, a 3-2 lens L37, a 3 -3 lens L38 and a 3-4 lens L39, the fourth lens group LG34 has negative refractive power and includes a 4-1 lens L310, the fifth lens group LG35 has positive refractive power and includes a 5-1 lens L311; the reflective element P4 includes An incident surface S41, a reflection surface S42 (not shown) and an exit surface S43, the first lens group LG41 has positive refractive power and includes a 1-1 lens L41 and a 1-2 lens L42, and the second lens group LG42 has Negative refractive power and includes a 2-1 lens L43, a 2-2 lens L44 and a 2-3 lens L45, the third lens group LG43 has a positive refractive power and includes a 3-1 lens L46, a 3-2 lens L47, a 3-3 lens L48 and a 3-4 lens L49, the fourth lens group LG44 has negative refractive power and includes a 4-1 lens L410, and the fifth lens group LG45 has positive refractive power and includes a 5-1 lens L411.

The reflective elements P1, P2, P3, and P4 are made of glass or plastic materials. Surfaces S11, S21, S31, S41 are connected to reflective surfaces S12, S22, S32, S42 (not shown), and are perpendicular to exit surfaces S13, S23, S33, S43, and incident surfaces S11, S21, S31, S41, reflect Surfaces S12 , S22 , S32 , and S42 (not shown) and the emitting surfaces S13 , S23 , S33 , and S43 are all flat surfaces.

1-1 Lenses L11, L21, L31, and L41 are meniscus lenses with negative refractive power and are made of glass material. spherical surface.

1-2 Lenses L12, L22, L32, L42 are biconvex lenses with positive refractive power, made of glass material, the first side S16, S26, S36, S46 are convex, the second side S17, S27, S37, S47 are convex , the first side surfaces S16, S26, S36, and S46 are spherical surfaces, and the second side surfaces S17, S27, S37, and S47 are aspheric surfaces.

The light-shielding elements ST11 , ST21 , ST31 , and ST41 include a variable hole, the variable hole can be changed in size according to different focal lengths of the imaging lens, and the variable hole is a non-circular hole. The shading element is a variable shading sheet, wherein the shape of the non-circular hole viewed from the axis direction is a polygon, a polygon that is symmetrical with the axis, a polygon that is asymmetric to the axis, a racetrack shape, a bottle shape, an oak barrel shape, Wave shape, flower shape, leaf shape, cloud shape, star shape, zigzag shape, heart shape or shapes that contain both straight lines and arcs or are connected by irregular lines. Such a design is beneficial to effectively reduce the size, thickness and volume of the imaging lens as a whole, and some shapes such as wave, cloud, star, and sawtooth shape can also achieve the effect of reducing stray light and ghosting.

2-1 Lenses L13, L23, L33 and L43 are meniscus lenses with negative refractive power and are made of glass material. It is a concave surface, the first side surfaces S19, S29, S39, and S49 are aspherical surfaces, and the second side surfaces S110, S210, S310, and S410 are spherical surfaces.

2-2 Lenses L14, L24, L34, and L44 are biconcave lenses with negative refractive power and are made of glass. , the first side surfaces S111 , S211 , S311 and S411 and the second side surfaces S112 , S212 , S312 and S412 are all spherical surfaces.

2-3 Lenses L15, L25, L35, L45 have positive refractive power and are made of glass material. The first side surfaces S113, S213, S313, and S413 are convex surfaces. , S214, S314, and S414 are all aspherical surfaces.

The apertures of the apertures ST12, ST22, ST32, and ST42 are fixed, and the aperture shape of the aperture is non-circular.

3-1 Lenses L16, L26, L36, and L46 are plano-convex lenses with positive refractive power and are made of glass. The first side surfaces S116, S216, S316, and S416 are convex surfaces, and the second side surfaces S117, S217, S317, and S417 are flat surfaces. , the first side surfaces S116, S216, S316, and S416 are aspherical surfaces.

3-2 Lenses L17, L27, L37, and L47 are biconvex lenses with positive refractive power and are made of glass. The first sides S118, S218, S318, and S418 are convex, and the second sides S119, S219, S319, and S419 are convex. , the first side surfaces S118, S218, S318, and S418 and the second side surfaces S119, S219, S319, and S419 are all aspherical surfaces.

3-3 Lenses L18, L28, L38, and L48 are meniscus lenses with negative refractive power and are made of glass. It is a convex surface, the first side surfaces S120, S220, S320, and S420 are spherical surfaces, and the second side surfaces S121, S221, S321, and S421 are aspheric surfaces.

3-4 Lenses L19, L29, L39, L49 are meniscus lenses with negative refractive power, Made of glass material, the first side S122, S222, S322, S422 are convex, the second side S123, S223, S323, S423 are concave, the first side S122, S222, S322, S422 are aspherical surfaces, the second The side surfaces S123, S223, S323, and S423 are spherical surfaces.

4-1 Lenses L110, L210, L310, and L410 are meniscus lenses with negative refractive power and are made of plastic materials. aspheric surface.

5-1 Lenses L111, L211, L311, and L411 are meniscus lenses with positive refractive power and are made of plastic materials. aspheric surface.

In addition, the imaging lenses 1, 2, 3, and 4 satisfy at least one of the following conditions (1) to (16):

1.5<f1/fW<2.5; (1)

-1.1<f2/fW<-0.3; (2)

0.6<f3/fW<0.8; (3)

-2<f4/fW<-0.5; (4)

1<f5/fW<3.5; (5)

2<TTL/fW<4.5; (6)

0.5<fT/TTL<1; (7)

7mm<Dmax<12mm; (8)

3.8<TTL/Dmax<5.2; (9)

2.9<fT/D1r1<4.2; (10)

0.5mm<EPA/PL<5.5mm; (11)

0.7mm<EPA/STD<10mm; (12)

0.2<EPDX/STD<2.1; (13)

0<EPDY/STD<1.5; (14)

0.8<PL/EPDX<4; (15)

0.7<PH/EPDY<3; (16)

Among them, f1 is an effective focal length of the first lens group LG11, LG21, LG31, LG41 in the first to fourth embodiments, f2 is the first to fourth embodiments, the second lens group LG12, An effective focal length of LG22, LG32, LG42, f3 is an effective focal length of the third lens group LG13, LG23, LG33, LG43 in the first to fourth embodiments, f4 is the first to fourth embodiments Among them, one of the effective focal lengths of the fourth lens group LG14, LG24, LG34, and LG44, f5 is the effective focal length of the fifth lens group LG15, LG25, LG35, and LG45 in the first to fourth embodiments, and fW is the first In the first to fourth embodiments, the imaging lenses 1, 2, 3, and 4 are an effective focal length at the wide-angle end, and fT is the imaging lenses 1, 2, 3, and 4 in the first to fourth embodiments. An effective focal length at the telephoto end, TTL is the first embodiment to the fourth embodiment, the incident surfaces S11, S21, S31, S41 of the reflective elements P1, P2, P3, P4 are respectively to an imaging surface IMA1, IMA2, A distance between IMA3 and IMA4 in the directions of vertical axes AX1, AX2, AX3 and AX4 (not shown) and on the axes AX1, AX2, AX3 and AX4, Dmax is the first to fourth embodiments, among all lenses One of the largest optical effective diameters, D1r1 is an optical effective diameter of the first side S14, S24, S34, S44 of the lenses L11, L21, L31, L41 closest to the first side in the first to fourth embodiments , EPA is an area of an entrance pupil of one of the imaging lenses 1, 2, 3, 4 in the first to fourth embodiments, PL is the reflection elements P1, P2, One of the lengths of P3 and P4, which is equal to the reflective surfaces S12, S22, S32, and S42 (not shown in the figure) shown) a length of a side length, this side length and the axes AX1, AX2, AX3, AX4 are perpendicular to each other, STD is one of the diameters of the apertures ST12, ST22, ST32, ST42 in the first embodiment to the fourth embodiment, EPDX In the first to fourth embodiments, the entrance pupil passes through one of the axes AX1, AX2, AX3, AX4 with the largest entrance pupil spacing, EPDY is the first to fourth embodiments, the entrance pupil passes through the axes AX1, AX2 , AX3, AX4 one of the minimum entrance pupil distance, PH is the first embodiment to the fourth embodiment, a height of the reflecting elements P1, P2, P3, P4, this height is equal to the exit surface S13, S23, S33, S43 One side has a length, and the length of the side is perpendicular to the incident surfaces S11, S21, S31, and S41. The imaging lenses 1, 2, 3, and 4 can effectively shorten the total length of the lens, effectively shorten the lens thickness, effectively improve the resolution, effectively improve the image brightness uniformity, effectively correct the aberration, and effectively correct the chromatic aberration and realize Optical zoom function.

The first embodiment of the imaging lens of the present invention will now be described in detail. Please refer to FIG. 1, FIG. 2 and FIG. 3 at the same time, the imaging lens 1 includes a reflective element P1, a first lens group LG11, a light shielding element in sequence from a first side to a second side along an axis AX1 The element ST11, a second lens group LG12, an aperture ST12, a third lens group LG13, a fourth lens group LG14, a fifth lens group LG15 and a filter OF1. The first lens group LG11 includes a 1-1 lens L11 and a 1-2 lens L12 in sequence from the first side to the second side along the axis AX1. The second lens group LG12 includes a 2-1 lens L13 , a 2-2 lens L14 and a 2-3 lens L15 in sequence from the first side to the second side along the axis AX1 . The third lens group LG13 includes a 3-1 lens L16 , a 3-2 lens L17 , a 3-3 lens L18 and a 3-4 lens L19 in sequence from the first side to the second side along the axis AX1 . The fourth lens group LG14 includes a 4-1 lens L110. The fifth lens group LG15 includes a 5-1 lens L111. The incident surface S11 faces an object side (not shown) along the vertical axis direction (not shown), when imaging, the light from the object side (not shown) enters the reflective element P1 from the incident surface S11, and passes through the reflective surface S12 (not pictured shown) reflection changes the traveling direction, and then passes through the exit surface S13, the first lens group LG11, the light shielding element ST11, the second lens group LG12, the aperture ST12, the third lens group LG13, the fourth lens group LG14, and the fifth lens group in sequence The LG15 and the filter OF1 are finally imaged on an imaging plane IMA1. The imaging plane IMA1 and the incident plane S11 are perpendicular to each other and the outgoing plane S13 is parallel to each other. In the first embodiment, the reflection element P1 is taken as an example but not limited to this. The reflection element P1 may also be a reflection mirror, which only includes a reflection surface. In the above description, the first side is the conventional object side, and the second side is the conventional image side.

When the imaging lens 1 is zoomed from the wide-angle end (as shown in Figure 1) to the middle end (as shown in Figure 2), the first lens group LG11 is fixed, and the second lens group LG12 moves to the second side along the axis AX1 , the third lens group LG13 is fixed, the fourth lens group LG14 moves to the second side along the axis AX1, and the fifth lens group LG15 moves to the first side along the axis AX1, so that the first lens group LG11 and the second lens group The distance between LG12 becomes larger, the distance between the second lens group LG12 and the third lens group LG13 becomes smaller, the distance between the third lens group LG13 and the fourth lens group LG14 becomes larger, and the distance between the fourth lens group LG14 and the fifth lens group LG15 becomes larger. The pitch becomes smaller, and the pitch between the fifth lens group LG15 and the filter OF1 becomes larger. When the imaging lens 1 zooms from the middle end (as shown in Fig. 2) to the telephoto end (as shown in Fig. 3), the first lens group LG11 is fixed, and the second lens group LG12 moves to the second side along the axis AX1 , the third lens group LG13 is fixed, the fourth lens group LG14 moves to the first side along the axis AX1, and the fifth lens group LG15 moves to the first side along the axis AX1, so that the first lens group LG11 and the second lens group The distance between LG12 becomes larger, the distance between the second lens group LG12 and the third lens group LG13 becomes smaller, the distance between the third lens group LG13 and the fourth lens group LG14 becomes smaller, and the distance between the fourth lens group LG14 and the fifth lens group LG15 becomes smaller. As the pitch increases, the distance between the fifth lens group LG15 and the filter OF1 increases. When the imaging lens 1 of the first embodiment zooms from the wide-angle end (as shown in Figure 1) to the telephoto end (as shown in Figure 3), its zoom ratio is about 3 times (36.25mm/12.41mm). ≒2.9).

A variable hole (not shown) of the shading element ST11 can be driven by a driving element (not shown) to change the size of the variable hole (not shown) to achieve multi-stage changes of the aperture. When lens 1 is zoomed from the wide-angle end (as shown in Fig. 1) to the middle end (as shown in Fig. 2) and from the middle end (as shown in Fig. 2) to the telephoto end (as shown in Fig. 3), The variable hole (not shown) of the light-shielding element ST11 will change with the focal length of the imaging lens 1 , and correspondingly change the hole size and then change the aperture value (f-Number).

Among the first lens group LG11 , the second lens group LG12 , the third lens group LG13 , the fourth lens group LG14 and the fifth lens group LG15 , the optical effective range of at least one lens is non-circular symmetry, so that the short-side direction is optically effective The diameter length is different from the optical effective diameter length in the long side direction, that is, the lens is viewed from the axis direction, and the optical effective diameter area of the lens is non-circular. The minimum diameter length, as shown in Figure 6, is a schematic diagram of the optical effective diameter length of the lens in the short side direction and the long side direction when the imaging lens 1 of the first embodiment is at the telephoto end, and the long side can be seen from Figure 6 The length of the optical effective diameter in the direction is obviously larger than the length of the optical effective diameter in the short side direction.

The 3-2 lens L17 and the 3-3 lens L18 of the third lens group LG13 can move along the direction of the vertical axis AX1 for optical anti-shake effect. The fourth lens group LG14 is movable along the axis AX1 for autofocusing. According to paragraphs 1 to 18 of [Embodiment], wherein:

1-1 The first side S14 of the lens L11 is convex, and the second side S15 is concave; 2-3 The lens L15 is a meniscus lens, and its second side S114 is concave; 4-1 The first side S124 of the lens L110 is Convex, the second side S125 is concave; 5-1 The first side S126 of the lens L111 is a convex surface, and the second side S127 is a concave surface;

The first side S128 and the second side S129 of the filter OF1 are both flat surfaces;

Using the above-mentioned lens, reflective element P1, shading element ST11, aperture ST12, and designs that satisfy at least one of the conditions (1) to (10), the imaging lens 1 can effectively shorten the total length of the lens, effectively shorten the thickness of the lens, Effectively improve resolution, effectively improve image brightness uniformity, effectively correct aberration, effectively correct chromatic aberration and realize optical zoom function.

Table 1 is a table of relevant parameters of each lens when the imaging lens 1 is at the wide-angle end, the middle end, and the telephoto end in Figures 1, 2, and 3, respectively.

The aspheric surface concavity z of the aspheric lens in Table 1 is obtained by the following formula:

z=ch ² /{1+[1-(k+1)c ² h ² ] ^1/2 }+Ah ⁴ +Bh ⁶ +Ch ⁸ +Dh ¹⁰ +Eh ¹² +Fh ¹⁴ +Gh ¹⁶

Among them: c: curvature; h: vertical distance from any point on the lens surface to the optical axis; k: conic coefficient; A~G: aspheric coefficient.

Table 2 is a table of relevant parameters of the aspheric surface of the aspheric lens in Table 1, where k is the Conic Constant, and A~G are the aspheric coefficients.

Table 3 shows the relevant parameter values of the imaging lens 1 of the first embodiment and the calculated values of the corresponding conditions (1) to (10). It can be seen from Table 3 that the imaging lens 1 of the first embodiment can meet the conditions (1). ) to the requirements of condition (10).

In addition, the optical performance of the imaging lens 1 of the first embodiment can also meet the requirements. It can be seen from FIG. 4A that the field curvature of the imaging lens 1 of the first embodiment is between -0.08mm and 0.05mm at the wide-angle end. It can be seen from FIG. 4B that the distortion of the imaging lens 1 of the first embodiment is between 0% and 2% at the wide-angle end. It can be seen from FIG. 5A that the field curvature of the imaging lens 1 of the first embodiment at the telephoto end is between -0.10 mm and 0.06 mm. It can be seen from FIG. 5B that the distortion of the imaging lens 1 of the first embodiment at the telephoto end is between 0% and 1%. In addition, the first embodiment of the The field curvature and distortion of the image lens 1 at the middle end can also meet the requirements, and the illustration thereof is omitted here.

It is obvious that the field curvature and distortion of the imaging lens 1 of the first embodiment can be effectively corrected, thereby obtaining better optical performance.

Please refer to FIG. 7, FIG. 8 and FIG. 9 at the same time, the imaging lens 2 includes a reflective element P2, a first lens group LG21, a light shielding element in sequence from a first side to a second side along an axis AX2 The element ST21, a second lens group LG22, an aperture ST22, a third lens group LG23, a fourth lens group LG24, a fifth lens group LG25 and a filter OF2. The first lens group LG21 includes a 1-1 lens L21 and a 1-2 lens L22 in sequence from the first side to the second side along the axis AX2. The second lens group LG22 includes a 2-1 lens L23, a 2-2 lens L24 and a 2-3 lens L25 in sequence from the first side to the second side along the axis AX2. The third lens group LG23 includes a 3-1 lens L26, a 3-2 lens L27, a 3-3 lens L28, and a 3-4 lens L29 in sequence from the first side to the second side along the axis AX2. The fourth lens group LG24 includes a 4-1 lens L210. The fifth lens group LG25 includes a 5-1 lens L211. The incident surface S21 faces an object side (not shown) along the vertical axis direction (not shown). When imaging, the light from the object side (not shown) enters the reflective element P2 through the incident surface S21, and passes through the reflective surface S22. (not shown) reflection changes the traveling direction, and then passes through the exit surface S23, the first lens group LG21, the light shielding element ST21, the second lens group LG22, the aperture ST22, the third lens group LG23, the fourth lens group LG24, the The five lens groups LG25 and the filter OF2 are finally imaged on an imaging plane IMA2. The imaging plane IMA2 and the incident plane S21 are perpendicular to each other and the exit plane S23 is parallel to each other. In the second embodiment, the reflective element P2 is taken as an example but not based on this As a limitation, the reflecting element P2 may also be a reflecting mirror, which only includes a reflecting surface.

When the imaging lens 2 is zoomed from the wide-angle end (as shown in Fig. 7) to the middle end (as shown in Fig. 8), the first lens group LG21 is fixed, and the second lens group LG22 is along the axis AX2 Moving to the second side, the third lens group LG23 is fixed, the fourth lens group LG24 moves to the second side along the axis AX2, and the fifth lens group LG25 moves to the first side along the axis AX2, so that the first lens group LG21 The distance between the second lens group LG22 and the second lens group LG22 becomes larger, the distance between the second lens group LG22 and the third lens group LG23 becomes smaller, the distance between the third lens group LG23 and the fourth lens group LG24 becomes larger, and the fourth lens group LG24 and the third lens group LG24 become larger. The distance between the five lens groups LG25 is reduced, and the distance between the fifth lens group LG25 and the filter OF2 is increased. When the imaging lens 2 zooms from the middle end (as shown in Fig. 8) to the telephoto end (as shown in Fig. 9), the first lens group LG21 is fixed, and the second lens group LG22 moves to the second side along the axis AX2 , the third lens group LG23 is fixed, the fourth lens group LG24 moves to the first side along the axis AX2, and the fifth lens group LG25 moves to the first side along the axis AX2, so that the first lens group LG21 and the second lens group The distance between LG22 becomes larger, the distance between the second lens group LG22 and the third lens group LG23 becomes smaller, the distance between the third lens group LG23 and the fourth lens group LG24 becomes smaller, and the distance between the fourth lens group LG24 and the fifth lens group LG25 becomes smaller. As the pitch increases, the distance between the fifth lens group LG25 and the filter OF2 increases. When the imaging lens 2 of the second embodiment zooms from the wide-angle end (as shown in Fig. 7) to the telephoto end (as shown in Fig. 9), its zoom ratio is about 3.00 times (37.20mm/12.39mm≒3.0).

A variable hole (not shown) of the shading element ST21 can be driven by a driving element (not shown) to change the size of the variable hole (not shown) to achieve multi-stage changes in the aperture. 2 When zooming from the wide-angle end (as shown in Fig. 7) to the middle end (as shown in Fig. 8) and from the middle end (as shown in Fig. 8) to the telephoto end (as shown in Fig. 9), block the light The variable hole (not shown) of the element ST21 will change with the focal length of the imaging lens 2 , and correspondingly change the hole size and then change the aperture value (f-Number).

The first lens group LG21, the second lens group LG22, the third lens group LG23, In the fourth lens group LG24 and the fifth lens group LG25, the optical effective range of at least one lens is non-circular symmetry, so that the length of the optical effective path in the short side direction is different from the length of the optical effective path in the long side direction, when the imaging lens 2 is in the telephoto position. At the end of the lens, the schematic diagram of the length of the optical effective diameter in the short-side direction and the long-side direction of the lens is similar to Figure 6.

The 3-2 lens L27 and the 3-3 lens L28 of the third lens group LG23 can be moved along the direction of the vertical axis AX2 for optical anti-shake effect. The fourth lens group LG24 is movable along the axis AX2 for autofocusing. According to paragraphs 1 to 18 of [Embodiment], wherein:

1-1 The first side S24 of the lens L21 is convex, and the second side S25 is concave; 2-3 The lens L25 is a meniscus lens, and its second side S214 is concave; 4-1 The first side S224 of the lens L210 is Convex, the second side S225 is concave; the first side S226 of the 5-1 lens L211 is convex, and the second side S227 is concave;

The first side S228 and the second side S229 of the filter OF2 are both planes;

Using the above-mentioned lens, reflective element P2, shading element ST21, aperture ST22 and designs that satisfy at least one of the conditions (1) to (10), the imaging lens 2 can effectively shorten the total length of the lens, effectively shorten the thickness of the lens, Effectively improve resolution, effectively improve image brightness uniformity, effectively correct aberration, effectively correct chromatic aberration and realize optical zoom function.

Table 4 is a table of relevant parameters of each lens when the imaging lens 2 is at the wide-angle end, the middle end, and the telephoto end in Figures 7, 8, and 9, respectively.

The definition of the aspherical surface concavity z of the aspherical lens in Table 4 is the same as the definition of the aspherical surface concavity z of the aspherical lens in Table 1 in the first embodiment. to repeat.

Table 5 is a table of relevant parameters of the aspheric surface of the aspheric lens in Table 4, where k is the Conic Constant, and A~G are the aspheric coefficients.

Table 6 shows the relevant parameter values of the imaging lens 2 of the second embodiment and the calculated values of the corresponding conditions (1) to (10). It can be seen from Table 6 that the imaging lens 2 of the second embodiment can meet the conditions (1). ) to the requirements of condition (10).

In addition, the optical performance of the imaging lens 2 of the second embodiment can also meet the requirements. It can be seen from FIG. 10A that the field curvature of the imaging lens 2 of the second embodiment is between -0.04mm and 0.02mm at the wide-angle end. It can be seen from FIG. 10B that the distortion of the imaging lens 2 of the second embodiment is between 0% and 1% at the wide-angle end. It can be seen from FIG. 11A that the field curvature of the imaging lens 2 of the second embodiment at the telephoto end is between -0.06 mm and 0.08 mm. It can be seen from FIG. 11B that the distortion of the imaging lens 2 of the second embodiment at the telephoto end is between -2% and 0%. In addition, the field curvature and distortion at the middle end of the imaging lens 2 of the second embodiment can also meet the requirements, and the illustration thereof is omitted here.

It is obvious that the field curvature and distortion of the imaging lens 2 of the second embodiment can be effectively corrected, thereby obtaining better optical performance.

Please refer to FIG. 12 , FIG. 13 and FIG. 14 at the same time, the imaging lens 3 includes a reflective element P3 , a first lens group LG31 , a light shielding element in sequence from a first side to a second side along an axis AX3 The element ST31, a second lens group LG32, an aperture ST32, a third lens group LG33, a fourth lens group LG34, a fifth lens group LG35 and a filter OF3. The first lens group LG31 includes a 1-1 lens L31 and a 1-2 lens L32 in sequence from the first side to the second side along the axis AX3. The second lens group LG32 includes a 2-1 lens L33, a 2-2 lens L34 and a 2-3 lens L35 in sequence from the first side to the second side along the axis AX3. The third lens group LG33 includes a 3-1 lens L36, a 3-2 lens L37, a 3-3 lens L38, and a 3-4 lens L39 in sequence from the first side to the second side along the axis AX3. The fourth lens group LG34 includes a 4-1 lens L310. The fifth lens group LG35 includes a 5-1 lens L311. The incident surface S31 is along the vertical axis direction (not shown in the figure) shown) toward an object side ((not shown), when imaging, the light from the object side (not shown) enters the reflective element P3 from the incident surface S31, and is reflected by the reflective surface S32 (not shown) to change the traveling direction, and then Through the exit surface S33, the first lens group LG31, the shading element ST31, the second lens group LG32, the aperture ST32, the third lens group LG33, the fourth lens group LG34, the fifth lens group LG35, the filter OF3, and finally The image is formed on an imaging surface IMA3, and the imaging surface IMA3 and the incident surface S31 are perpendicular to each other and the exit surface S33 is parallel to each other. In the third implementation, the reflective element P3 is taken as an example but not limited to this, and the reflective element P3 can also be a mirror , including only one reflective surface.

When the imaging lens 3 is zoomed from the wide-angle end (as shown in Fig. 12) to the middle end (as shown in Fig. 13), the first lens group LG31 is fixed, and the second lens group LG32 moves to the second side along the axis AX3 , the third lens group LG33 is fixed, the fourth lens group LG34 moves to the second side along the axis AX3, and the fifth lens group LG35 moves to the first side along the axis AX3, so that the first lens group LG31 and the second lens group The distance between LG32 becomes larger, the distance between the second lens group LG32 and the third lens group LG33 becomes smaller, the distance between the third lens group LG33 and the fourth lens group LG34 becomes larger, and the distance between the fourth lens group LG34 and the fifth lens group LG35 becomes larger. The pitch becomes smaller, and the pitch between the fifth lens group LG35 and the filter OF3 becomes larger. When the imaging lens 3 is zoomed from the middle end (as shown in Fig. 13) to the telephoto end (as shown in Fig. 14), the first lens group LG31 is fixed, and the second lens group LG32 moves to the second side along the axis AX3 , the third lens group LG33 is fixed, the fourth lens group LG34 moves to the first side along the axis AX3, and the fifth lens group LG35 moves to the first side along the axis AX3, so that the first lens group LG31 and the second lens group The distance between LG32 becomes larger, the distance between the second lens group LG32 and the third lens group LG33 becomes smaller, the distance between the third lens group LG33 and the fourth lens group LG34 becomes smaller, and the distance between the fourth lens group LG34 and the fifth lens group LG35 becomes smaller. As the pitch increases, the distance between the fifth lens group LG35 and the filter OF3 increases. The imaging lens 3 of the third embodiment consists of a wide-angle end (as shown in FIG. 12 ). When zooming to the telephoto end (as shown in Figure 14), the zoom ratio is about 2.976 times (36.84mm/12.38mm≒2.976).

A variable hole (not shown) of the shading element ST31 can be driven by a driving element (not shown) to change the size of the variable hole (not shown) to achieve multi-stage changes of the aperture. 3 When zooming from the wide end (as shown in Fig. 12) to the middle end (as shown in Fig. 13) and from the middle end (as shown in Fig. 13) to the telephoto end (as shown in Fig. 14), block the light The variable hole (not shown) of the element ST31 will change with the focal length of the imaging lens 3, and correspondingly change the hole size and then change the aperture value (f-Number).

In the first lens group LG31, the second lens group LG32, the third lens group LG33, the fourth lens group LG34 and the fifth lens group LG35, the optical effective range of at least one lens is non-circular symmetry, so that the short-side direction is optically effective The diameter is different from the optical effective diameter in the long direction. When the imaging lens 3 is at the telephoto end, the schematic diagram of the optical effective diameter in the short and long directions of the lens is similar to Figure 6.

The 3-2 lens L37 and the 3-3 lens L38 of the third lens group LG33 can move along the direction of the vertical axis AX3 for optical anti-shake effect. The fourth lens group LG34 is movable along the axis AX3 for autofocusing. According to paragraphs 1 to 18 of [Embodiment], wherein:

1-1 The first side S34 of the lens L31 is convex, and the second side S35 is concave; 2-3 The lens L35 is a meniscus lens, and its second side S314 is concave; 4-1 The first side S324 of the lens L310 is Convex, the second side S325 is concave; the first side S326 of the 5-1 lens L311 is convex, and the second side S327 is concave;

The first side S328 and the second side S329 of the filter OF3 are both flat surfaces;

Using the above-mentioned lens, reflective element P3, shading element ST31, aperture ST32 and designs that satisfy at least one of the conditions (1) to (10), the imaging lens 3 can effectively shorten the total length of the lens, effectively shorten the thickness of the lens, Effectively improve resolution, effectively improve image brightness uniformity, effectively correct aberration, effectively correct chromatic aberration and realize optical zoom function.

Table 7 is a table of relevant parameters of each lens when the imaging lens 3 is at the wide-angle end, the middle end, and the telephoto end in Figures 12, 13, and 14, respectively.

The definition of the aspherical surface concavity z of the aspherical lens in Table 7 is the same as the definition of the aspherical surface concavity z of the aspherical lens in Table 1 in the first embodiment, and will not be repeated here.

Table 8 is a table of relevant parameters of the aspherical surface of the aspherical lens in Table 7, where k is the Conic Constant, and A~G are the aspherical coefficients.

Table 9 shows the relevant parameter values of the imaging lens 3 of the third embodiment and the calculated values of the corresponding conditions (1) to (10). It can be seen from Table 9 that the imaging lens 3 of the third embodiment can meet the conditions (1). ) to the requirements of condition (10).

In addition, the optical performance of the imaging lens 3 of the third embodiment can also meet the requirements. It can be seen from FIG. 15A that the field curvature of the imaging lens 3 of the third embodiment is between -0.04mm and 0.02mm at the wide-angle end. It can be seen from FIG. 15B that the distortion of the imaging lens 3 of the third embodiment at the wide-angle end is between 0% and 2%. It can be seen from FIG. 16A that the field curvature of the imaging lens 3 of the third embodiment at the telephoto end is between -0.02 mm and 0.08 mm. It can be seen from FIG. 16B that the distortion of the imaging lens 3 of the third embodiment at the telephoto end is between 0% and 1%. In addition, the field curvature and distortion at the middle end of the imaging lens 3 of the third embodiment can also meet the requirements, and the illustration thereof is omitted here.

It is obvious that the field curvature and distortion of the imaging lens 3 of the third embodiment can be effectively corrected, thereby obtaining better optical performance.

Please refer to Figure 17, Figure 18 and Figure 19 at the same time, the imaging lens 4 along the An axis AX4 includes a reflective element P4, a first lens group LG41, a light shielding element ST41, a second lens group LG42, an aperture ST42, and a third lens group LG43 in sequence from a first side to a second side , a fourth lens group LG44, a fifth lens group LG45 and a filter OF4. The first lens group LG41 includes a 1-1 lens L41 and a 1-2 lens L42 in sequence from the first side to the second side along the axis AX4. The second lens group LG42 includes a 2-1 lens L43, a 2-2 lens L44 and a 2-3 lens L45 in sequence from the first side to the second side along the axis AX4. The third lens group LG43 includes a 3-1 lens L46, a 3-2 lens L47, a 3-3 lens L48, and a 3-4 lens L49 in sequence from the first side to the second side along the axis AX4. The fourth lens group LG44 includes a 4-1 lens L410. The fifth lens group LG45 includes a 5-1 lens L411. The incident surface S41 faces an object side (not shown) along the vertical axis direction (not shown), when imaging, the light from the object side (not shown) enters the reflective element P4 from the incident surface S41, and passes through the reflective surface S42 (not shown) reflection changes the traveling direction, and then passes through the exit surface S43, the first lens group LG41, the light shielding element ST41, the second lens group LG42, the aperture ST42, the third lens group LG43, the fourth lens group LG44, the The five-lens group LG45 and the filter OF4 are finally imaged on an imaging surface IMA4. The imaging surface IMA4 and the incident surface S41 are perpendicular to each other and the output surface S43 is parallel to each other. In the fourth embodiment, the reflective element P4 is taken as an example but not based on this As a limitation, the reflecting element P4 may also be a reflecting mirror, including only one reflecting surface.

When the imaging lens 4 is zoomed from the wide-angle end (as shown in Fig. 17) to the middle end (as shown in Fig. 18), the first lens group LG41 is fixed, and the second lens group LG42 moves to the second side along the axis AX4 , the third lens group LG43 is fixed, the fourth lens group LG44 moves to the second side along the axis AX4, and the fifth lens group LG45 moves to the second side along the axis AX4, so that the first lens group LG41 and the second lens group The distance between LG42 becomes larger, the distance between the second lens group LG42 and the third lens group LG43 becomes smaller, the distance between the third lens group LG43 and the fourth lens group LG44 becomes larger, The distance between the fourth lens group LG44 and the fifth lens group LG45 is increased, and the distance between the fifth lens group LG45 and the filter OF4 is decreased. When the imaging lens 4 is zoomed from the middle end (as shown in Fig. 18) to the telephoto end (as shown in Fig. 19), the first lens group LG41 is fixed, and the second lens group LG42 moves to the second side along the axis AX4 , the third lens group LG43 is fixed, the fourth lens group LG44 moves to the first side along the axis AX4, and the fifth lens group LG45 moves to the second side along the axis AX4, so that the first lens group LG41 and the second lens group The distance between LG42 becomes larger, the distance between the second lens group LG42 and the third lens group LG43 becomes smaller, the distance between the third lens group LG43 and the fourth lens group LG44 becomes smaller, and the distance between the fourth lens group LG44 and the fifth lens group LG45 becomes smaller. The pitch increases, and the distance between the fifth lens group LG45 and the filter OF4 decreases. When the imaging lens 4 of the fourth embodiment zooms from the wide-angle end (as shown in Fig. 17) to the telephoto end (as shown in Fig. 19), the zoom ratio is about 3.218 times (29.93mm/9.30mm≒3.218).

A variable hole (not shown) of the shading element ST41 can be driven by a driving element (not shown) to change the size of the variable hole (not shown) to achieve multi-stage changes of the aperture. 4 When zooming from the wide-angle end (as shown in Fig. 17) to the middle end (as shown in Fig. 18) and from the middle end (as shown in Fig. 18) to the telephoto end (as shown in Fig. 19), block the light The variable hole (not shown) of the element ST41 will change with the focal length of the imaging lens 4, and correspondingly change the hole size and then change the aperture value (f-Number).

In the first lens group LG41, the second lens group LG42, the third lens group LG43, the fourth lens group LG44, and the fifth lens group LG45, the optical effective range of at least one lens is non-circular symmetry, so that the short-side direction is optically effective The diameter is different from the optical effective diameter in the long-side direction. When the imaging lens 4 is at the telephoto end, the schematic diagram of the optical effective diameter in the short-side direction and the long-side direction of the lens is similar to Figure 6.

The 3-2 lens L47 and the 3-3 lens L48 of the third lens group LG43 can move along the direction of the vertical axis AX4 for optical anti-shake effect. The fourth lens group LG44 is movable along the axis AX4 for autofocusing. According to paragraphs 1 to 18 of [Embodiment], wherein:

1-1 The first side S44 of the lens L41 is concave, and the second side S45 is convex; 2-3 The lens L45 is a biconvex lens, and its second side S414 is convex; 4-1 The first side S424 of the lens L410 is concave, The second side S425 is a convex surface; the first side S426 of the 5-1 lens L411 is a concave surface, and the second side S427 is a convex surface;

The first side S428 and the second side S429 of the filter OF4 are both planes;

Using the above-mentioned lens, reflective element P4, shading element ST41, aperture ST42 and designs that satisfy at least one of the conditions (1) to (16), the imaging lens 4 can effectively shorten the total length of the lens, effectively shorten the thickness of the lens, Effectively improve resolution, effectively improve image brightness uniformity, effectively correct aberration, effectively correct chromatic aberration and realize optical zoom function.

Table 10 is a table of relevant parameters of each lens when the imaging lens 4 is at the wide-angle end, the middle end, and the telephoto end in Figs. 17, 18, and 19, respectively.

The definition of the aspherical surface concavity z of the aspherical lens in Table 10 is the same as the definition of the aspherical surface concavity z of the aspherical lens in Table 1 in the first embodiment, and will not be repeated here.

Table 11 is a table of relevant parameters of the aspherical surface of the aspherical lens in Table 10, where k is the Conic Constant, and A~G are the aspherical coefficients.

Table 12 shows the relevant parameter values of the imaging lens 4 of the fourth embodiment and the calculated values of the corresponding conditions (1) to (10), and Table 13 shows the correlation of the imaging lens 4 of the fourth embodiment at the wide-angle end Parameter values and their corresponding calculated values of conditions (11) to (16), Table 14 shows the relevant parameter values and their corresponding conditions (11) to (16) when the imaging lens 4 of the fourth embodiment is at the middle end Table 15 shows the relevant parameter values when the imaging lens 4 of the fourth embodiment is at the telephoto end and the calculated values of the corresponding conditions (11) to (16). It can be seen from Table 14 and Table 15 that the imaging lens 4 of the fourth embodiment can all meet the requirements of the conditions (1) to (16).

In addition, the optical performance of the imaging lens 4 of the fourth embodiment can also meet the requirements. It can be seen from FIG. 20A that the field curvature of the imaging lens 4 of the fourth embodiment is between -0.04mm and 0.03mm at the wide-angle end. It can be seen from FIG. 20B that the distortion of the imaging lens 4 of the fourth embodiment at the wide-angle end is between -6% and 0%. It can be seen from FIG. 21A that the field curvature of the imaging lens 4 of the fourth embodiment at the telephoto end is between -0.06 mm and 0.04 mm. It can be seen from FIG. 21B that the distortion of the imaging lens 4 of the fourth embodiment at the telephoto end is between 0% and 2%. In addition, the field curvature and distortion at the middle end of the imaging lens 4 of the fourth embodiment can also meet the requirements, and the illustration thereof is omitted here.

It can be seen that the field curvature and distortion of the imaging lens 4 of the fourth embodiment can be effectively corrected, thereby obtaining better optical performance.

In the above embodiment, only one reflective element is provided on the first side and the first lens group However, it can be understood that another reflective element can also be added between the first lens group and the fifth lens group, or between the fifth lens group and the second side, that is, a reflective element is arranged on the first lens group. Between the side and the first lens group, another reflective element is arranged between the first lens group and the fifth lens group or between the fifth lens group and the second side, in other words, the reflective element may be arranged between the first side and the second side. Between the second sides should also belong to the scope of the present invention.

Although the present invention has been disclosed in the above embodiments, it is not intended to limit the present invention. Anyone who is familiar with the art can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection of the present invention The scope shall be determined by the scope of the appended patent application.

1: Imaging lens

P1: Reflective element

LG11: The first lens group

ST11: Shading element

LG12: Second lens group

ST12: Aperture

LG13: The third lens group

LG14: Fourth lens group

LG15: Fifth lens group

OF1: filter

L11:1-1 lens

L12: 1-2 lens

L13: 2-1 lens

L14: 2-2 lens

L15: 2-3 lens

L16:3-1 lens

L17: 3-2 lens

L18: 3-3 lens

L19: 3-4 lens

L110: 4-1 lens

L111: 5-1 lens

IMA1: Imaging plane

AX1: axis

S11: Incident surface

S13: Exit surface

S14: 1-1 lens first side

S15: 1-1 lens second side

S16: 1-2 lens first side

S17: 1-2 lens second side

S18: shading element surface

S19: 2-1 lens first side

S110: The second side of the 2-1 lens

S111: The first side of the 2-2 lens

S112: The second side of the 2-2 lens

S113: The first side of the 2-3 lens

S114: 2-3 lens second side

S115: Aperture Surface

S116: The first side of the 3-1 lens

S117: The second side of the 3-1 lens

S118: 3-2 lens first side

S119: The second side of the 3-2 lens

S120: 3-3 lens first side

S121: The second side of the 3-3 lens

S122: 3-4 lens first side

S123: 3-4 lens second side

S124: The first side of the 4-1 lens

S125: The second side of the 4-1 lens

S126: 5-1 lens first side

S127: 5-1 lens second side

S128: The first side of the filter

S129: The second side of the filter

Claims (10)

An imaging lens, comprising: a first lens group, the first lens group has positive refractive power; a second lens group, the second lens group has negative refractive power; a third lens group, the third lens group has positive refractive power; a fourth lens group having negative refractive power; and a fifth lens group, the fifth lens group has positive refractive power; Wherein the first lens group, the second lens group, the third lens group, the fourth lens group and the fifth lens group is sequentially arranged along an axis from a first side to a second side; The light from an object side passes through the first lens group, the second lens group, the third lens group, the fourth lens group and the fifth lens group to the second side in sequence; It further includes a reflective element, the reflective element includes a reflective surface, and the reflective element is disposed between the first side and the second side; The distance between the lens groups can be changed, so that the imaging lens can change the focal length. The imaging lens of claim 1, further comprising a shading element disposed between the first lens group and the second lens group, the shading element comprising a variable hole, the variable hole The size of the variable hole can be changed according to different focal lengths of the imaging lens, and the variable hole is a non-circular hole. The imaging lens as described in item 1 of the claimed scope, wherein at least one lens in the lens group has an optical effective diameter in the short-side direction different from the optical effective diameter in the long-side direction, and the fourth lens group can be along the axis move to bring the imaging lens into focus. The imaging lens of claim 1, wherein the third lens group includes a plurality of lenses, and some of the lenses can be moved along the direction perpendicular to the axis to achieve optical anti-shake. The imaging lens of claim 1, wherein the second lens group, the fourth lens group and the fifth lens group are movable along the axis, and the first lens group and the third lens group are fixed , so as to change the distance between the lens groups, so that the imaging lens changes the focal length, and the reflective element is arranged between the first side and the first lens group. The imaging lens of claim 5, further comprising an aperture disposed between the second lens group and the third lens group, the reflective element further comprising an incident surface, an exit surface and the reflective surface Connected, the incident surface faces the object side along the direction perpendicular to the axis, the exit surface faces the second side along the axis, and the imaging lens satisfies at least one of the following conditions: 0.5mm<EPA/PL<5.5mm; 0.7mm<EPA/STD<10mm; 0.2<EPDX/STD<2.1; 0<EPDY/STD<1.5; 0.8<PL/EPDX<4; 0.7<PH/EPDY<3; Among them, EPA is an area of an entrance pupil of the imaging lens, PL is a length of the reflective element, and the length is equal to a length of a side of the reflective surface, which is perpendicular to the axis, and STD is the aperture a diameter, EPDX is the maximum pupil distance of the entrance pupil passing through one of the axes, EPDY is the minimum pupil distance of the entrance pupil passing through one of the axes, and PH is the reflection A height of the element, the height is equal to a length of a side length of the exit surface, and the side length direction is perpendicular to the incident surface. The imaging lens as described in item 1 of the claimed scope, wherein: The first lens group includes a 1-1 lens and a 1-2 lens, the 1-1 lens is a meniscus lens with negative refractive power, the 1-2 lens is a biconvex lens with positive refractive power, and includes a convex surface along the The axis faces the first side and the other convex surface faces the second side along the axis, the 1-1 lens and the 1-2 lens are sequentially arranged along the axis from the first side to the second side; The second lens group includes a 2-1 lens, a 2-2 lens and a 2-3 lens, the 2-1 lens is a meniscus lens with negative refractive power, and includes a convex surface facing the first lens along the axis side and a concave surface facing the second side along the axis, the 2-2 lens is a biconcave lens with negative refractive power, and includes a concave surface facing the first side along the axis and another concave surface facing the first side along the axis Two sides, the 2-3 lens has positive refractive power and includes a convex surface along the axis toward the first side, the 2-1 lens, the 2-2 lens and the 2-3 lens along the axis from the first side side to the second side in order; The third lens group includes a 3-1 lens, a 3-2 lens, a 3-3 lens and a 3-4 lens, the 3-1 lens is a plano-convex lens with positive refractive power, and includes a convex surface along the axis Facing the first side and a plane facing the second side along the axis, the 3-2 lens is a biconvex lens with positive refractive power, and includes a convex surface facing the first side along the axis and another convex surface along the axis The axis faces the second side, the 3-3 lens is a meniscus lens with negative refractive power, and includes a concave surface facing the first side along the axis and a convex surface facing the second side along the axis, the 3-3 lens 4 The lens is a meniscus lens with negative refractive power, and includes a convex surface facing along the axis The first side and a concave surface face the second side along the axis, and the 3-1 lens, the 3-2 lens, the 3-3 lens and the 3-4 lens are along the axis from the first side to the The second side is arranged in sequence; the fourth lens group includes a 4-1 lens, the 4-1 lens is a meniscus lens with negative refractive power; and The fifth lens group includes a 5-1 lens, and the 5-1 lens is a meniscus lens with positive refractive power. The imaging lens as described in item 7 of the patent application scope, wherein: the 1-1 lens includes a convex surface facing the first side along the axis and a concave surface facing the second side along the axis; The 2-3 lens further includes a concave surface facing the second side along the axis; The 4-1 lens includes a convex surface facing the first side along the axis and a concave surface facing the second side along the axis; and The 5-1 lens includes a convex surface facing the first side along the axis and a concave surface facing the second side along the axis. The imaging lens as described in item 7 of the patent application scope, wherein: the 1-1 lens includes a concave surface facing the first side along the axis and a convex surface facing the second side along the axis; The 2-3 lens further includes another convex surface facing the second side along the axis; The 4-1 lens includes a concave surface facing the first side along the axis and a convex surface facing the second side along the axis; and The 5-1 lens includes a concave surface facing the first side along the axis and a convex surface facing the second side along the axis. The imaging lens according to any one of claims 1 to 5 or 7 to 9 in the scope of the patent application, wherein the reflective element further comprises an incident surface connected to the reflective surface, and the incident surface is along the When facing the object side perpendicular to the axis, the imaging lens satisfies at least one of the following conditions: 1.5<f1/fW<2.5; -1.1<f2/fW<-0.3; 0.6<f3/fW<0.8; -2<f4/fW<-0.5; 1<f5/fW<3.5; 2<TTL/fW<4.5; 0.5<fT/TTL<1; 7mm<Dmax<12mm; 3.8<TTL/Dmax<5.2; 2.9<fT/D1r1<4.2; Wherein, f1 is an effective focal length of the first lens group, f2 is an effective focal length of the second lens group, f3 is an effective focal length of the third lens group, f4 is an effective focal length of the fourth lens group, f5 is an effective focal length of the fifth lens group, fW is an effective focal length of the imaging lens at the wide-angle end, fT is an effective focal length of the imaging lens at the telephoto end, and TTL is the incident surface of the reflective element to An imaging plane is perpendicular to the axis and a distance on the axis, D _MAX is one of the largest optically effective diameters of all lenses, D1r1 is an optically effective diameter of one of the first sides of the lens closest to the first side .

Images